We are going to discuss Cisco’s proprietary extensions to STP algorithm, namely UplinkFast and BackBone Fast. Those two features aim to reduce the time it takes STP to re-activate topology after a link failure. While UplinkFast seems pretty intuitive, BB Fast is more complicated. See more detailed overview at: http://blog.ine.com/wp-content/uploads/2010/04/understanding-stp-rstp-convergence.pdf UplinkFast
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